4
.
1.42
Katherm QK –
Trench convector with energy-efficient EC tangential fan
Ready-to-install convector-based trench convectors
Assembly and installation instructions
Limits of operation and use
Limits of operation
Min./max. water temperature
°C
15-90
Min./max. air intake temperature
°C
15-40
Min./max. air humidity
%
15-75
Max. operating pressure
bar
10
Min./max. glycol percentage
%
25-50
Water quality
pH
*1
8-9
Conductivity
*1
µS/cm
< 700
Oxygen content (O
2
)
mg/l
< 0.1
Hardness
°dH
4-8.5
Sulphur ions (S)
not measurable
Sodium ions (Na
+
)
mg/l
< 100
Iron ions (Fe
2+
,Fe
3+
)
mg/l
< 0.1
Manganese ions (Mn
2+
)
mg/l
<0.05
Ammonia ions (NH
4+
)
mg/l
< 0.1
Chlorine ions (CI)
mg/l
< 100
CO
2
ppm
< 50
Sulfate ions (SO
4
2-
)
mg/l
< 50
Nitrite ion (NO
2
-
)
mg/l
< 50
Nitrate ion (NO
3
-
)
mg/l
< 50
We would refer to VDI-2035 Sheets 1 & 2, DIN EN 14336 and DIN EN
14868 with regard to the properties of the medium used to protect the
equipment. The following values provide further guidance.
The water used should be free of contamination, such as suspended sub-
stances and reactive substances.
